Astronomy Picture of the Day . ... How do dying stars eject their outer layers? Stars that create elegant planetary nebulas like Henize 3-401, pictured above, are not unusual, causing speculation that, one day, our own Sun may look like this. A Star Cluster in Motion . ... A Setting Sun Trail . ... NGC 1569: Heavy Elements from a Small Galaxy . ... For the open cluster of stars NGC 6520, every day is like this. On the left of the above picture are many of NGC 6520's bright blue stars. ...

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... Galaxy Cluster in the Early Universe . ... Explanation: Long before medieval alchemists dreamed of transmuting base metals to gold , stellar furnaces in this massive cluster of galaxies - cataloged as RDCS 1252.9-2927 - had transformed light elements into heavy ones . ... The cluster elemental abundances are consistent with the idea that most heavy elements were synthesized early on by massive stars, but current theories suggest that such a massive cluster should be rare in the early Universe . ...

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• APOD: February 25, 1999 - NGC 6712: Galactic Globular Cluster
• APOD: February 14, 1997 - NGC 1818: A Young Globular Cluster
• APOD: 2002 February 3 - The Coma Cluster of Galaxies

... February 21, 1996 . Millions of Stars in Omega Centauri . ... Explanation: Pictured above is the largest ball of stars in our Galaxy. About 10 million stars orbit the center of this globular cluster - named Omega Centauri - as this giant globular cluster orbits the center of our Galaxy . Recent evidence indicates that Omega Centauri is by far the most massive of the about 160 globular clusters in the Milky Way . ... About APOD | ...

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• APOD: February 22, 1999 - NGC 1316: After Galaxies Collide
• APOD: 2000 January 12 - NGC 6791: An Old, Large Open Cluster
• APOD: December 13, 1997 - The Coma Cluster of Galaxies

... 21 cm HI-line spectra of southern ZOA galaxies . ... Galaxies are distributed in a cosmic web consisting of high-density clusters and galaxy groups, which are embedded in walls, and filaments surrounding large low-density regions, the so-called voids. ... The attached image shows the distribution of the 394 inclined spiral galaxies selected from the Parkes HI Zone of Avoidance survey (HIZOA) color coded by their velocity. ... today * ATNF | Parkes | ...

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... Tonight's Sky . ... The Magazine . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... What is the heaviest element that astronomers can detect? ... The heaviest element that astronomers have found in space is the same as the heaviest element naturally occurring on Earth: uranium. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email...

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• Web Extra: Astronomers animate one of the largest galaxy clusters ever observed
• Do globular clusters form in a galaxy's halo or migrate in from outside? If the
• February 2008 | Astronomy.com

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to E-ELT Armazones . ... Survey Telescopes . ... Images . ... Star Clusters . ... Usage of ESO Images and Videos . ... Usage of ESO Videos and Images . ... Stars@ESO . ... ESO Science Newsletter . ... Catch a Star 2013 . ... The pie-chart shows the starтАЩs composition: it is almost entirely made from hydrogen and helium with only a tiny trace of heavier elements. ...

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• The star cluster NGC 3293 | ESO
• IAU 207, Extragalactic Star Clusters
• Around the Cat's Paw Nebula | ESO

Most of these images were obtained by Mike Bessell, Michelle Buxton, Hwankyung Sung, Ralph Sutherland and Bob Watson at SSO using a 2Kx2K Site CCD behind a Nikon or Hasselblad lens or directly on the 1m telescope. A few images are from the Hubble Space Telescope. Some of the M42 images were obtained with the KPNO 1m and ESO NTT telescope. One image is a mosaic of IRAS images. ... Details of the CCD imaging program at MSSSO. ... antenna.jpg (53KB) . ... ngc6744.jpg (59KB) . ...

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• GSAOI Super Star Clusters Science Page
• GSAOI Open Cluster Science Page
• GSAOI Globular Cluster Science Page

... We address a question if globular clusters (GC) in a protogalaxy could for some time evolve chemically as isolated systems, enriching themselves with heavy elements produced in first supernova events that follow initial star formation. We determine both the critical mass of a protoglobular cluster that is needed to retain the ejecta of the very first supernova, and the critical energy (i.e., number of supernovae) that is needed to expel the residual gas from a cluster of a given mass. ...

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... These Frontier Fields will combine the power of HST with the natural gravitational telescopes of high-magnification clusters of galaxies. ... We are soliciting gravitational lensing maps for the last four Hubble Frontier Fields clusters (MACSJ0717.5+3745, MACSJ1149.5+2223, AbellS1063, and Abell 370) based upon the exceptionally deep HST FF imaging and other new ancillary data. ... For the full set of proposal instructions and requirements, see the FY16 Frontier Fields Lensing Map Call for Proposals....

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• HST this week: 0547
• Gregory F Snyder
• HST this week: 039

M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

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• The Galaxy Gallery Page IX: Clusters of Galaxies
• Astronomy HyperText Book: Stellar Clusters
• Astronomy HyperText Book: Interstellar Medium

... The overall globular cluster population is divided by gap in the metallicity function at [Fe/H]=-1.0 into two discrete groups with well-defined maxima at [Fe/H]=-1.60?0.03 dex, and -0.60?0.04 dex. ... Clusters with extremely blue horizontal branches occupy a spherical volume of radius ~ 9 kpc, have high rotational velocities ( V rot =77?33 km/s), have substantial and equal negative radial and vertical metallicity gradients, and are, on average, the oldest group (the old-halo subsystem). ...

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• Vladimir Marsakov Publication List
• Population of Galactic globular clusters, figures

... Home Lectures Lecture Series 2015-2016 . ... Lecture Series 2014-2015 . ... Beyond New York City . ... The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the public. ... Amateur Astronomer Association is pleased to announce we will be offering select, limited reserved seating for current AAA members for the Friday, January 8, 2015 AAA Lecture entitled Robert Nemiroff ?2015 Astronomy Picture of the Day?. ...

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• Lecture Series 2014-2015 ? Amateur Astronomers Association of New York
• Lecture Series ? Amateur Astronomers Association of New York
• Astro-Imaging ? Page 14 ? Amateur Astronomers Association of New York

... n For illustration, examine a coarsened (256 в 256) set of images, with 3 clusters Clustering AIA data Clusters in log Y space Clusters in Y /n space Distribution of pixels in each cluster Distribution of pixels in each cluster Simulated Data Simulated Temperature Distributions 4 5 6 logT 7 8 9 Simulated Data Simulated Data Simulated Data Simulated Data Simulated Data: Results Simulated Data: Results Simulated Data: Results Simulated Data: Results How to make images of results more meaningful? ...

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• The AstroStat Slog survey
• The AstroStat Slog Blog Archive my first AAS. IV. clustering
• The AstroStat Slog pretty pictures

... The Pleiades star cluster, also known as the Seven Sisters and Messier 45, is a conspicuous object in the night sky with a prominent place in ancient mythology . ... The stars in the Pleiades are thought to have formed together around 100 million years ago, making them 1/50th the age of our sun, and they lie some 130 parsecs (425 light years ) away. ... Data for these stars are listed in a table below. ... Yes . ... WEBDA Pleiades cluster data . ... M45: The Pleiades Star Cluster (2007 November 18) ...

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• Some pictures of the Arecibo Observatory
• Pulsar Highlights - A Dozen new MSPs in Globular Clusters
• What is HISA?

... Главная . ... Новости . ... Проекты . Любителям астрономии . Проект ISON . ... Подробнее . ... Категория: Новости проекта ISON . ... Метки: Космический мусор ,љ Астероиды ,љ Гамма-всплески ,љ Любителям астрономии ,љ Кометы љ . ... Метки: Космический мусор ,љ Астероиды ,љ Любителям астрономии љ . ... Новости обсерваторий проекта] - Обсерватория Кубанского государственного университета от Иванов А - 09.04.2016 11:08:49 . ... 1999-2013 Copyright "Астрономия и Телескопостроение" . ...

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Astronotes Armagh Planetarium's Stellar Blog! ... Comets and Asteroids . ... Image credit:ESO/J.Emerson/VISTA. ... However others are less pessimistic and it has even been claimed that the mysterious ?Wow! signal? received in 1977 originated from the direction M55.б  Sadly, this still unexplained pulse of radio energy originated from a location rather to the northwest of M55 so I doubt if the source was this cluster (if indeed the signal was genuinely of extraterrestrial origin). ... Mysterious Wow! ...

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• Omega Centauri: globular cluster of 300,000 stars | Astronotes
• Wonders of the February Night Sky | Astronotes
• NGC4666: Secrets of a Starburst Galaxy | Astronotes

... Astronomy and Astrophotography - amateur tips and ideas from personal experience. ... CNES : CLEMENTINE data Server - Access to 1.8 million lunar images . ... Astrofili on the Web - Dr. Fabio Marino's CCD images and links. Astronomical Images - Deep-sky astronomical photographs. ... Astronomy Page - collection of amateur astrophotographs, along with observatory and Hubble images. ... Igor's Astronomy Page - with thumbnail links to images from observatories, including the Hubble Space Telescope. ...

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... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Biography: From his schooldays in Copenhagen, J.L.E. Dreyer showed unusual ability in history, mathematics and physics - the subjects which were to form the background to his later work. ... From 1878-1882 he became assistant at Dunsink Observatory before moving to Armagh where he became Director in 1882. ... A Short History of Armagh Observatory . ... Dreyer's History of the Armagh Observatory . ...

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• David Asher home page
• Armagh Observatory: Chris Winter [ Bookmarks ]
• William Herschel

... Universe At Your Fingertips Activities TOC . ... Why do we have stereotypes about what an astronomer looks like? ... A reading list on 20th century astronomers and their work is included in the Resources Bibliographies section of the Universe at Your Fingertips. ... Be sure the students do the activity before the astronomer comes. ... After the visit, give students an opportunity to talk about how the astronomer was similar or different from the mental picture they had before the visit. ...

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• ASP: Big Clusters, Tiny Galaxies
• ASP: An Ancient Universe - Changes in Stars
• Astronomical Society

The spectrophotometrical complex of the 6-m telescope in Nasmyth-1 focus . ... A new sample of 360 blue compact galaxies with a strong star formation was build on the base of the Second Byurakan Survey. ... More that 20 galaxies with the extremely low-abundances of heavy elements in the range of 1/30-1/10 of the Sun's one, were found. ... During the 15-years observation term near 500 spectra of the unique source SS~433, from which the relativistic jets were found for the first time, were obtained. ...

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• Age of the Universe
• A 20 cm VLA survey of Abell clusters of galaxies
• Old "Structure" publications